staging: comedi: s626: local functions should not be exposed globally

The 'ResetADC' function is prototyped as a static but is missing
the static tag in it's definition. The function is only referenced
in this file so add the static tag to the definition.

This quiets a sparse warning about:

warning: symbol 'ResetADC' was not declared. Should it be static?
Signed-off-by: H Hartley Sweeten <hsweeten@visionengravers.com>
Cc: Ian Abbott <abbotti@mev.co.uk>
Cc: Frank Mori Hess <fmhess@users.sourceforge.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/comedi/drivers/s626.c

@@ -1348,7 +1348,7 @@ static void s626_detach(struct comedi_device *dev)
 /*
  * this functions build the RPS program for hardware driven acquistion
  */
-void ResetADC(struct comedi_device *dev, uint8_t * ppl)
+static void ResetADC(struct comedi_device *dev, uint8_t *ppl)
 {
 	register uint32_t *pRPS;
 	uint32_t JmpAdrs;